[Bug c++/108873] Using the C++ front-end causes no DCE from happening

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108873

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|tree-optimization           |c++

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
For the C++ front-end:
The statement/expression:
**e == 0;
Is not emitted to the gimple, meaning the following statements are not added:
    e.0_1 = e;
    _2 = *e.0_1;
    _3 = *_2;

Which means evpr does see the above and then optimizing:
  _8 = _2 != 0B;

as _2 cannot be a null ptr.